This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 70 |
| 3 | 1134 |
| 4 | 9870 |
| 5 | 59220 |
| 6 | 275562 |
| 7 | 1063530 |
| 8 | 3552978 |
| 9 | 10577385 |
| 10 | 28652260 |
| 11 | 71725108 |
| 12 | 167911380 |
| 13 | 371057232 |
| 14 | 779831820 |
| 15 | 1568210220 |
| 16 | 3032733564 |
| 17 | 5663906745 |
| 18 | 10251608346 |
| 19 | 18037546450 |
| 20 | 30931714450 |
| 21 | 51814612980 |
| 22 | 84952851750 |
| 23 | 136562787270 |
| 24 | 215565263550 |
| 25 | 334584493425 |